Hitachi WH 12DM2, Technical Data And Service Manual

Page 1: ...PECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST Nos WH 12DM2 F887 WR 12DM2 F886 Sep 2003 W MODELS WH 12DM2 WR 12DM2 Hitachi Power Tools CORDLESS IMPACT DRIVER WH 12DM2 CORDLESS IMPACT WRENCH WR 12DM2 WH 12DM2 WR 12DM2 ...

Page 2: ...f company name s and model name s of our competitor s The symbol s utilized here is are as follows Symbol Utilized Competitor Company Name Model Name C MAKITA 6916D WH 12DM2 Symbol Utilized Competitor Company Name Model Name C1 MAKITA 6918D WR 12DM2 P DEWALT DW052 P DEWALT DW053 C2 MAKITA BTW150 ...

Page 3: ...5 7 5 Number of Screws or Bolts Driven 26 7 6 Actual Noise When Tightening Wood Screws 26 8 PRECAUTIONS IN SALES PROMOTION 27 8 1 Safety Instructions 27 8 2 Tightening Torque Inspection Prior to Operation 29 8 3 Tightening Torque Variation 29 8 4 Suggestions and Precautions for the Efficient Use of the Charger 30 9 OTHER PRECAUTIONS 31 10 REPAIR GUIDE 32 10 1 Precautions in Disassembly and Reassem...

Page 4: ...revious Model WR 12DM and C2 14 4 V cordless impact wrench 3 APPLICATIONS Tightening loosening of small screws tapping screws wood screws bolts nuts etc Drilling into wood and various other materials with use of optional accessory drill chuck adapter Applicable Markets Wood product assembly Tightening loosening of wood screws Construction industry Assembly of scaffolding roofing aluminum sashes fe...

Page 5: ...witch is located near the axis and easy to operate Protector Protects workpieces from scratches and stains Resistant to being caught on bracing plates etc Does not get hot even if operated continuously New cyber design The titanium silver color and the embossed nameplate present a powerful and classy styling Class top short body 155 mm Palm size 12 mm with respect to the previous model C 168 mm Co...

Page 6: ...420 in lbs C2 150 N m 1530 kgf cm 1330 in lbs Selling points common to the Model WH 12DM2 New design Elastomer is new titanium silver color Protector is standard Convenient light equipped hook High durability dust resistance and long service life Advanced case excellent accommodation Compact body Overall length of the Model WR 12DM2 with respect to WR 12DM 11 mm C1 14 mm P 6 mm C2 31 mm ...

Page 7: ... 1 battery 2 batteries 3 batteries Burnout C Smoking As shown in the above graph C produces smoke when operating on one battery When tightening wood screws 5 3 mm diameter and 120 mm long into a workpiece hemlock spruce continuously it suddenly takes much time to tighten the tenth and the later screws This is because thin wires used in the armature assembly of C are apt to produce heat and the coo...

Page 8: ...y 11 mm 2 Idle gear The greater the striking force the stronger gear section is required The Models WH 12DM2 WR 12DM2 are equipped with dust resistant contact seal bearings Thanks to the new bearings hermeticity is enhanced because the seals of the bearings always contact the inner rings C non contact bearings The labyrinth construction is provided between the housing and the fan at the pinion sid...

Page 9: ...29 233 1 75 1 75 C2 193 27 253 1 9 1 95 Impact wrench L A H Weight L A H Weight Measured value 1 2 3 New cyber design The Models WH 12DM2 WR 12DM2 have vibrant and cyber looks thanks to the widely adopted soft urethane resin elastomer and the complicated 3 D curved surfaces stirring up curiosity to touch them The soft urethane resin colored new titanium silver also catches the eye in show windows ...

Page 10: ...rotector entirely The protector is made of elastomer having high heat resistance and it does not impair the integrated looking of the Models WH 12DM2 WR 12DM2 4 Protector Although the previous model s hammer case designed for professional use is sturdy and well reputed a standard protector for the hammer case is desired to protect the surface of a workpiece such as flooring materials from being sc...

Page 11: ...en using two alkali batteries on the market as a guide Refer to the Instruction Manual for replacement of the batteries This hook battery type is mountable on either side and the angle is easily adjustable 5 Light equipped hook Patent applied for The light equipped hook has the following two functions It can be used as a hook for suspending from a waist belt when required by the nature of the work...

Page 12: ...12DM2 WR 12DM2 are equipped with the separate type motor without case and the slim tail section with narrow housing tail the previous Model WH 12DM has the same construction More delicate speed control is required at the start of tightening screws The Models WH 12DM2 WR 12DM2 have a grip whose circumference at the switch section is shorter than the competitors for ease of operation grip circumfere...

Page 13: ...r and the optimized impact timing Thus the large hammer tightens screws powerfully with lower operating noise than the Model WH 12DM Refer to page 26 for details 9 Enhanced maintainability The carbon brushes are replaceable and the armature is singly replaceable thanks to the separate type motor like a 100 V motor the previous model has the same construction ...

Page 14: ...lbs 800 694 in lbs 1200 1042 in lbs N m 120 1600 1389 in lbs 112 109 115 140 100 60 200 174 in lbs 1000 868 in lbs 600 521 in lbs 1400 1215 in lbs kgf cm 20 P C Tightening torque 122 70 90 150 WH 12DM2 WH 12DM 700 608 in lbs 1300 1129 in lbs N m 110 1500 1302 in lbs 112 109 115 130 500 434 in lbs 1100 955 in lbs 900 781 in lbs kgf cm 50 P C 122 112 100 107 Forward Reverse Forward Reverse Forward R...

Page 15: ...mm long The tightening torque of the Model WR 12DM2 is substantially higher than the previous model 12 V and equivalent to or more than C2 The data above are intended for reference purposes only because actual tightening torque will vary depending on tightening conditions To describe the merit of high tightening torque the comparison data are shown in Figures 2 and 3 Figure 2 shows the time requir...

Page 16: ... at both sides are sunk into the lumber by 1 3 mm respectively The Model WR 12DM2 can tighten strap bolts and corner bracings used in Japanese wooden buildings speedily as it can sink washers into a workpiece quickly The data above are intended for reference purposes only because actual time required for sinking washers will vary depending on tightening conditions 0 4 2 6 4 9 10 8 3 7 9 1 4 2 6 3 ...

Page 17: ...odel WR 12DM2 is about 1 1 times larger than the Model WR 12DM and it is equivalent to or more than C2 as shown in the table below WR 12DM2 C2 WR 12DM Model Unit V Outside diameter of hammer D mm Height of hammer H mm Voltage kgmm2 WR 12DM2 12 44 18 6 38 4 3240 WR 12DM 12 42 6 20 37 4 3140 C1 12 42 16 5 31 7 3070 80 100 110 Hammer inertia J Number of strokes N J x N2 No of strokes min P 12 44 2 18...

Page 18: ... 5 mm 1 3 64 Battery Type EB 1220BL Sealed cylindrical nickel cadmium batteries Nominal voltage DC 12V Nominal life Charging discharging approximately 1 000 cycles in case of Model UC 14YF2 UC 14YFA Nominal capacity 2 0 Ah 162 mm 6 3 8 x 226 mm 8 9 Battery Type EB 1230HL Sealed cylindrical nickel metal hydride batteries Nominal voltage DC 12V Nominal life Charging discharging approximately 500 cyc...

Page 19: ...220BL type battery is 55 C and the EB 1230HL type battery is 45 C 1 In the case of tapping screws and wood screws a minimum of M3 1 8 is possible 2 This torque is based on tightening an M14 9 16 bolt strength grade 12 9 for 3 seconds with a hexagonal socket 3 This torque is based on tightening an M16 5 8 bolt F10T for 3 seconds with a hexagonal socket 4 Main body does not include accessory tools h...

Page 20: ...5 2 9 16 12 5 16 Hexagon socket 996179 13 1 2 65 2 9 16 13 8 mm Hexagon socket 996180 14 9 16 65 2 9 16 14 10 mm Hexagon socket small type 996181 16 5 8 65 2 9 16 16 10 mm Hexagon socket 996182 17 21 32 65 2 9 16 17 10 mm Hexagon socket 996197 21 53 64 166 6 17 32 21 1 2 Hexagon long socket Woodworking drill bit Code No 959183 14 mm dia 35 64 83 mm 3 17 64 Drill chuck adaptor set Code No 996195 Th...

Page 21: ...3536 873624 873626 873627 873629 Hexagon socket 12 7 mm 1 2 Square drive dimension Sq Part name Code No Nominal diameter of applicable bolts Dihedral width H mm Shape Socket primary dimensions mm L M 6 1 4 M 8 5 16 M 10 3 8 M 12 15 32 M 14 9 16 M 16 5 8 M 8 5 16 M 10 3 8 M 12 15 32 M 14 9 16 M 16 5 8 M 18 23 32 L1 8 5 16 8 5 16 9 11 32 9 11 32 8 5 16 9 11 32 10 3 8 14 9 16 15 9 16 D1 18 23 32 20 2...

Page 22: ...ket primary dimensions mm L L1 20 25 32 20 25 32 20 25 32 24 15 16 24 15 16 24 15 16 24 15 16 24 15 16 24 15 16 24 15 16 24 15 16 25 63 64 D1 20 25 32 21 5 53 64 22 7 8 25 1 25 1 28 1 3 32 28 1 3 32 31 1 7 32 31 1 7 32 31 1 7 32 32 5 1 9 32 34 1 11 32 L2 ISO Ordinary ISO Small type Inch screw ISO High strength M 8 5 16 M 10 3 8 M 10 3 8 M 12 15 32 M 12 15 32 M 14 9 16 M 16 5 8 M 8 5 16 M 10 3 8 M ...

Page 23: ...bs 0 2 390 0 2 850 167 x 226 6 37 64 x 9 21 32 26 1 1 64 1 66 3 7 lbs 70 Driver chuck Variable speed switch with forward reverse changeover lever DC magnet 12 28 EB 1220BL or EB 1230HL EB 1220BL 2 0 EB 1230HL 3 0 12 0 40 UC 14YF2 44 7 2 14 4 Plastic tool case Charger UC 14YF2 1 P M 5 M 12 3 16 15 32 M 5 M 10 3 16 3 8 115 1170 kgf cm 1020 in lbs 0 2 400 0 3 000 1 75 3 9 lbs 115 1170 kgf cm 1020 in ...

Page 24: ...1 64 1 67 3 7 lbs 70 Plunger Variable speed switch with forward reverse changeover lever DC magnet 12 28 EB 1220BL or EB 1230HL EB 1220BL 2 0 EB 1230HL 3 0 12 5 40 UC 14YF2 44 7 2 14 4 Plastic tool case Charger UC 14YF2 P M 6 M 12 1 4 15 32 0 2 400 0 3 000 1 75 3 9 lbs 162 1653 kgf cm 1429 in lbs 0 2 410 0 3 120 168 x 233 6 39 64 x 9 11 64 29 1 9 64 1 75 3 9 lbs 76 Variable speed switch with forwa...

Page 25: ...M 1200 120 100 80 20 40 60 0 0 0 140 1400 P Test conditions Bolt M14 x 50 mm high strength bolt Steel plate SS34P Thickness 25 mm Accessory tool Hexagon socket length 40 mm width across flat 19 mm 2 Impact wrench Test conditions Bolt M16 x 55 mm 5 8 x 2 5 32 F10T Steel plate Mild steel Thickness 25 mm Accessory tool Hexagon socket ass y 1 Impact driver WR 12DM2 C 200 0 1 2 3 400 600 800 1000 WR 12...

Page 26: ...fficient 0 17 Strength grade and rated axial stress of threads Strength grade Rated axial stress kgf mm2 Material Heat treatment 4 8 6 8 8 8 12 9 29 1 43 7 58 2 95 Mild steel Alloy steel including Ni Mn Cr etc None Processed hard material Diameter and effective sectional areas of threads Kind of thread x pitch Effective sectional area of thread mm2 M5 x 0 8 mm 3 16 14 2 M6 x 1 mm 1 4 20 1 M8 x 1 2...

Page 27: ...ing time indicates the impact time after the lower surface of the bolt has come in contact with the material into which it is being tightened In the tightening conditions shown in Figs 6 1 and 6 2 the screws are being tightened directly into a steel plate accordingly the torque goes up very abruptly in comparison with ordinary bolt tightening conditions Fig 6 2 Bolt Nut Steel plate thickness t The...

Page 28: ... 1 6 sec P 7 4 Tightening Time Thanks to the new higher power rare earth magnet motor having 20 greater magnetic force and the 35 larger hammer the Model WH 12DM2 gives optimum impact at tightening screws with the computer analysis and the tightening speed is 30 higher than the previous model Tightening time comparison is shown below The data below are intended for reference purposes only because ...

Page 29: ...larger hammer and the higher power motor for the higher tightening speed Although the higher tightening speed is realized the Model WH 12DM2 has the following disadvantage High startup current The Model WH 12DM2 consumes higher power than C for driving a short or machine screw because it requires high startup current Thus the number of machine screws driven per charge is different as shown above C...

Page 30: ...ge matches that indicated on the unit If this order is reversed the charger may not function properly 4 Ensure the power source voltage is the same as that indicated on the Name Plate of the charger Use of any other power source DC outlet fuel powered generator etc will cause the charger to overheat and burn out 5 Do not use any voltage increasing equipment transformer etc between the power source...

Page 31: ...cement is necessary 10 Disposal of the Type EB 1220BL or EB 1230HL Storage Battery Ensure that all customers understand that Type EB 1220BL or EB 1230HL Storage Batteries should be turned into any Hitachi power tool sales outlet or authorized service center when they are no longer capable of being recharged or repaired If thrown into a fire the batteries may explode or if discarded indiscriminatel...

Page 32: ...orque driver at the beginning of the tightening operations and as necessary during the tightening operations In addition the torque values shown in Para 7 3 2 above are useful as a handy reference and may be utilized as tentative standards 1 Voltage of battery Tightening torque is affected by the voltage output of the battery For example the relationship between tightening torque and the number of...

Page 33: ...iver chuck which is fitted onto the anvil in the main body will become worn and loose Wear and looseness will cause a proportionate loss of tightening torque In addition use of an incorrect size socket slightly larger than the bolt being tightened will also result in decreased torque 7 Bolt and nut rotate together Tightening torque that can be achieved will be considerably decreased if the bolt an...

Page 34: ...bolts or nuts it will not only cause insufficient tightening torque but could also easily cause damage to the socket Please refer to the tables in Para 6 2 for appropriate socket dimensions 3 Hammering section lubrication Grease Molub Alloy 777 1 is utilized in the hammering section Frequent or continuous use of the tool will cause excessive temperature rise of the hammering section resulting in d...

Page 35: ...rder by following the procedure shown in Figs 1 1 to 1 4 Be sure not to lose the two Steel Balls D3 5 9 in Anvil F 10 Hold the body and adjust the gap of the retaining ring to the groove of anvil F then insert a small flat blade screwdriver into the groove at an angle Press down washer D with the small flat blade screwdriver Fig 1 2 Fig 1 1 1 2 Small flat blade screwdriver Anvil F 10 Retaining Rin...

Page 36: ...Stopper 17 14 with a small flat blade screwdriver then release the hand press See Fig 2 Remove the hammer assembly from the J 297 base for washer S and support the end surface of Spindle D 18 15 With a hand press push down either of the raised faces of Hammer D 12 9 to compress Hammer Spring D 15 12 In this position extract the two Steel Balls D5 556 11 8 from the cam grooves of Spindle D 18 15 an...

Page 37: ...ner Cover A 25 22 Armature Ass y DC 12V 26 23 Magnet D 28 25 Brush Block 30 27 and DC Speed Control Switch 38 35 can be removed in a piece Pushing Button A 39 36 can also be removed Note Be careful not to break the three legs coming from the FET to avoid malfunction of the switch 9 Removal of the switch assembly Remove the two Machine Screws W Sp Washer M3 x 5 37 34 that secure the flag terminal a...

Page 38: ...y DC 12V 26 23 With a hand press push down the tip portion of the Armature Ass y DC 12 V 26 23 pinion to remove it 12 Removal of Ring Gear C 21 18 and the Damper 24 21 Remove Ring Gear C 21 18 from Inner Cover A 25 22 and remove the Damper 24 21 with a small flat blade screwdriver Ring Gear C 21 18 is firmly inserted in Inner Cover A 25 22 Insert a small flat blade screwdriver between Ring Gear C ...

Page 39: ...ternal wires of the Brush Block 30 27 to the DC Speed Control Switch 38 35 fasten them with the Machine Screw W Sp Washer M3 x 5 37 34 paying attention to the direction of the flag terminal Fig 6 DC Speed Control Switch 38 35 Internal wire red Internal wire black FET Brush Block 30 27 Machine Screw W Sp Washer M3 x 5 37 34 Flag terminal Fig 6 C c Before mounting the parts to housing A apply silico...

Page 40: ...de diameter of the Side Yoke 27 24 to the outside diameter of Magnet D 28 25 when mounting the Side Yoke 27 24 to Magnet D 28 25 See Fig 8 Insert the two Dampers 24 21 so that they fit into Inner Cover A 25 22 Fit the locking rib of Ring Gear C 21 18 to the concave portion of Damper 24 21 Press fit the Armature Ass y DC 12V 26 23 into Inner Cover A 25 22 Adjust the convex portion of Dust Guard Fin...

Page 41: ...Control Switch 38 35 see Fig 11 2 Apply silicone rubber ThreeBond 1211 to housing A and Inner Cover A 25 22 as shown in Fig 11 Mount housing B and secure them with seven Tapping Screws W Flange D4 x 20 Black 33 30 Wipe the silicone rubber coming out of the housing with a cloth Insert the Sleeve 46 42 into the Strap 45 41 and tighten the Machine Screw W Washers M4 x 25 47 43 3 Mounting the mechanic...

Page 42: ... 18 15 Cover it with the Hammer Case 8 4 and secure with the four Tapping Screws W Sp Washer D4 x 25 Black 7 3 Insert the two Steel Balls D3 5 9 into the hole of Anvil F 10 Mount Guide Sleeve B 4 Guide Spring A 3 and Washer D 2 in sequence Mount the Retaining Ring 1 into the groove of anvil using the J295 jigs A and B for retaining ring as illustrated in Fig 12 7 Reassembly of the hook Check that ...

Page 43: ...f Spindle D 18 15 5 mm diameter hole of Idle Gear Set 19 16 All around the Needle Roller 20 17 Twenty eight Steel Balls D3 175 13 10 10 Screw tightening torque Tapping Screw W Sp Washer D4 x 25 Black 7 3 1 96 0 49 N m 20 5 kgf cm 17 4 4 3 in lbs Tapping Screw W Flange D4 x 20 Black 33 30 1 96 0 49 N m 20 5 kgf cm 17 4 4 3 in lbs Machine Screw W Washers M4 x 25 47 43 1 27 1 96 N m 13 to 20 kgf cm 2...

Page 44: ...ed Variable WH 12DM2 Work Flow Inner Cover A Armature Ass y Magnet D Brush Block DC Speed Control Switch Hook Ass y Hammer Case Anvil F Ring Gear C Housing A B Set General Assembly Hammer D Steel Ball Hammer Spring D Spindle D Idle Gear Set Needle Roller Ball Bearing 6901VV Guide Sleeve B ...

Page 45: ...k Flow Inner Cover A Armature Ass y Magnet D Brush Block DC Speed Control Switch Hook Ass y Hammer Case Anvil R Ass y Ring Gear C Housing A B Set General Assembly WR 12DM2 Hammer D Steel Ball Hammer Spring D Spindle D Idle Gear Set Needle Roller Ball Bearing 6901VV ...

Page 46: ...F887 CORDLESS IMPACT DRIVER Model WH 12DM2 2003 8 20 E1 Hitachi Power Tools 501 501 502 503 15 11 13 16 12 14 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 37 38 39 37 36 44 45 46 47 48 49 50 42 43 41 40 1 2 3 4 5 6 7 8 9 10 ...

Page 47: ...C 1 22 319 911 WASHER E 1 23 690 1VV BALL BEARING 6901VVCMPS2L 1 24 319 909 DAMPER 2 25 321 664 INNER COVER A 1 26 360 599 ARMATURE ASS Y DC 12V 1 27 321 659 SIDE YOKE 1 28 321 668 MAGNET D 1 29 321 663 DUST GUARD FIN A 1 30 321 662 BRUSH BLOCK 1 31 999 054 CARBON BRUSH 5X6X11 5 1 PAIR 2 32 319 918 BRUSH CAP 2 33 302 086 TAPPING SCREW W FLANGE D4X20 BLACK 7 34 NAME PLATE 1 35 322 174 HOUSING A B S...

Page 48: ...22 271 DRESS UP SEAL A 1 FOR USA CAN 601 992 671 DRIVER BIT B NO 2 50L 1 602 992 672 DRIVER BIT B NO 3 50L 1 603 996 177 NON MAGNETIC HEX SOCKET 8MM 65L 1 604 985 329 NON MAGNETIC HEX SOCKET 10MM 65L 1 605 996 178 NON MAGNETIC HEX SOCKET 12MM 65L 1 606 996 179 NON MAGNETIC HEX SOCKET 13MM 65L 1 607 996 180 NON MAGNETIC HEX SOCKET 14MM 65L 1 608 996 181 NON MAGNETIC HEX SOCKET 16MM 65L 1 609 996 18...

Page 49: ... 4 ITEM NO CODE NO DESCRIPTION REMARKS NO USED 8 03 WH 12DM2 Printed in Japan 030820N ...

Page 50: ...LIST NO F886 CORDLESS IMPACT WRENCH Model WR 12DM2 2003 7 30 E1 Hitachi Power Tools 501 501 502 1 2 3 4 7 6 5 8 9 12 10 13 11 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 34 35 36 34 33 40 41 42 43 44 45 46 38 39 37 ...

Page 51: ...09 DAMPER 2 22 321 664 INNER COVER A 1 23 360 599 ARMATURE ASS Y DC 12V 1 24 321 659 SIDE YOKE 1 25 321 668 MAGNET D 1 26 321 663 DUST GUARD FIN A 1 27 321 662 BRUSH BLOCK 1 28 999 054 CARBON BRUSH 5X6X11 5 1 PAIR 2 29 319 918 BRUSH CAP 2 30 302 086 TAPPING SCREW W FLANGE D4X20 BLACK 7 31 NAME PLATE 1 32 322 174 HOUSING A B SET GREEN 1 33 322 242 HITACHI PLATE 1 34 994 532 MACHINE SCREW W SP WASHE...

Page 52: ...OVER 1 610 955 306 NEEDLE BEARING NTN BK1012 1 611 948 227 RETAINING RING FOR D47 HOLE 1 612 955 307 PINION 1 613 955 308 SLEEVE 1 614 955 309 WASHER 1 615 955 310 SOCKET COVER 1 616 955 311 SOCKET 1 617 303 247 SEAL LOCK HEX SOCKET HD BOLT M5X25 6 618 873 537 SOCKET PIN 1 619 873 187 O RING J1SW1516 1 620 991 481 FORM TIE SOCKET ASS Y 11 3MMX95L 1 INCLUD 618 619 621 992 610 UNIVERSAL JOINT ASS Y ...

Page 53: ... 619 638 955 150 HEX SOCKET ASS Y LONG 19MMX75L 1 INCLUD 618 619 639 955 143 HEX SOCKET ASS Y LONG 21MMX52L 1 INCLUD 618 619 640 955 151 HEX SOCKET ASS Y LONG 21MMX75L 1 INCLUD 618 619 641 991 480 HEX SOCKET ASS Y LONG 21MMX125L 1 INCLUD 618 619 642 955 144 HEX SOCKET ASS Y LONG 22MMX52L 1 INCLUD 618 619 643 986 058 HEX SOCKET FOR PLASTIC CONE 12MMX70L 1 INCLUD 618 619 644 873 633 EXTENSION BAR AS...

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